Surface Dislocation of MgO(100) Studied by Secondary Electron Emission Spectroscopy and Cathodoluminescence Spectroscopy

Abstract

Surface electronic and vibrational properties of “fine” and “defective” MgO(100) surfaces have been studied by secondary electron emission spectroscopy applying the electron time-of-flight method and cathodoluminescence spectroscopy under ultra-high vacuum. The energies of the bottom of the conduction band and a level related closely to the F center in MgO are determined to be 4.0 and 1.6 eV above the vacuum level, respectively. Work function, which is the energy difference between the vacuum level and the top of the valence band, of MgO is determined to be 3.8 eV. In the “defective” crystal, the phonon side band due to electron-phonon coupling is resolved around the extra peak at 1.6 eV in the secondary electron emission.